Pencil-sharpener.



J. SOTY.

PENCIL SHARPENER. APPLICATION FILED FEB. 24, 1915.

Patented May 9,1916.

JOSEPH SOTY, OF NEW YORK, N. Y.

PENCIL-SHARPENER.

Specification of Letters Patent.

Patented May 9, 1916.

Application filed February 24, 1915; Serial No. 10,169.

T all whom it may concern Be it known that I, Josnrn SoTY, a subject of the Emperor of Austria-Hungary, residing at New York, in the county of New York and State of New York, have invented new and useful Improvements in Pencil- Sharpeners, of which the following is a specification.

This invention relates to a pencil sharpener and has as its principal object to provide a device of this character which combines simplicity of construction with efficiency in operation.

A. further object of my invention is to provide such a device which may conveniently be carried in a pocket, which may be taken apart for sharpening the blades without the use of any tool and which sharpens the pencil quickly and easily.

A final object is to provide means for giving the pencil-point different shapes.

Reference will now be had to the accompanying drawing in which:

Figure 1 is a perspective view of my device showing it in use. Figs. 2, 3, 4, 5 and 6 are perspective views of different parts of my device. Figs. 7, 8 and 9 are elevational views showing the different shapes of pencil points out with my device. Fig. 10 is a partly sectional, partly elevational detail view on an enlarged scale.

The same part is designated bythe same reference character throughout the several views.

Referring more particularly to the drawing, 11 is a spirally threaded stem having an internally threaded bore in its top into which is screwed a knob 12, while on its lower end is formed an internally threaded mull? 18. On the stem 11 is provided a thumb-nut 1 1, threaded internally so as to correspond to the thread of the stem 11. Two symmetrical knifecarrying frames 1515, each having a semi-annular base portion 16, a pair of upwardly converging side-members 17 and an externally threaded semi-cylindrical top-portion 18, are adapted, when put together, to be engaged and se curely held together by the muff 13. On each of the knife-carrying frames 16 are provided, preferably integrally therewith, helically, bent cutting blades 19, the upper edge of which ending in a point 20 is sharpened and projects slightly into the substantially conoidal space inclosed between same.

The operation of my device is obvious from the drawing. The end of the pencil 21 held in one hand is inserted between the frames 16 while the thumb-nut 14: is at the upper end of the stem 11 and, seized by the thumb and finger of the other hand, is vigorously forced down the same. This will forcibly rotate the stem 11 and the frame 16 attached to it and the cutting blades 19 will then successively engage, first by their point 20, the end of the pencil 21, thus producing a cone shaped point thereon. The topmost blades 19 may be so bent that their points 20, nearly meet, in which case the graphite point of the pencil will be cone shaped as seen in Fig. 7, or the points 20, may be somewhat apart but still near enough to engage the graphite core of the pencil to a certain extent, in which case the end thereof will be cylindrically shaped as in Fig. 8. If the points 20 are spaced so far apart that they will not engage the graphite core at all, the latter will retain its original diameter and only the wooden mantle of the pencil will be sharpened. In both of the latter two cases the graphite core will pass between the points 20, and project into the space formed between the semi-cylindrical portions 18 of the frame 15. In the latter I may provide triangular blades 22 projecting inwardly and meeting at the center of said space, so as to produce a sharp point on the top of the graphite core as seen in Fig. 9.

To sharpen a new pencil it will require two or more operations of the kind above described. Between each operation the thumb-nut 14 may be returned to its original position by simply tilting over the de vice when it will glide back on account of its proper weight. To re-sharpen a pencil, one single operation will be suflicient.

It will be seen from the foregoing description and from the drawing, that on unscrewing the knob 12 the thumb-nut 14 may be removed from the stem 11 so that each part is easily exchangeable. The cutting blades 19 may also easily be sharpened when the device is taken apart.

It is understood that while I have thus described and shown the preferred form of embodiment of my invention, I do not want to be limited to its mechanical details, but may resort to such alterations and modifications as come within the scope of the claims hereunto appended.

I claim:

1. In a pencil sharpener, a pair of symmetrical knife carrying frames, each of said frames having a semi-annular base, two upwardly converging sides and a semicylindrical outwardly threaded upper portion, and a plurality of helically bent knives integrally formed on said frames, substantially as and for the purpose set forth.

2. In a pencil sharpener comprising knifecarrying frames and knives formed integrally With said frames, adapted to shave v the Wooden sheath of a pencil, separate knives of variable shape carried by said frame, for sharpening the core of the pencll, said separate knives being placed in continuation of said first mentioned knives so as 15 to allow the sharpening of the sheath and core in one continuous operation, substantially as and for the purpose set forth.

JOSEPH SOTY. Witnesses:

WILLIAM STANKovIo, FRITZ KADELBURG.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.? 

